Bane NOR assigned Implenia with a contract to build the double-track Tangenvika railway bridge. The total contract volume is around CHF 190 million (NOK 1.8 billion). The railway bridge will be a 1,022 m concrete prestressed bridge and also include a section on land of approximately two kilometers with a wildlife overpass.

Extra care is required during construction of the railway bridge since Lake Mj-sa is a source of drinking water with a rich fauna.